Individuals with overweight or obesity often face significant challenges in maintaining consistent physical activity due to psychological and physiological barriers such as low self-esteem, anxiety, and perceived stigma. Traditional exercise interventions have frequently emphasized aerobic activities, but recent literature suggests that strength training may offer unique psychosocial benefits for this population. A 2022 literature review updated earlier findings from 2016, confirming that strength exercises can moderately improve psychological outcomes such as self-efficacy, self-esteem, and quality of life for individuals who are overweight or obese. However, the evidence remains fragmented, with limited studies demonstrating substantial long-term effects, and a predominance of female participants in many trials. This article explores how strength training may impact mental health, the psychological mechanisms implicated, and the implications for designing effective interventions.
Psychological Constructs Affected by Strength Training
A review of studies conducted in recent years reveals that strength training may influence several key psychological outcomes for individuals with overweight or obesity. These outcomes are particularly important in the context of mental health, as they contribute to emotional resilience, motivation for health behavior change, and overall well-being. A 2017 review by ten Hoor et al. focused on eight primary psychological constructs: self-efficacy, self-esteem, mood, psychological disorders (e.g., anxiety and depression), inhibition, outcome expectations, quality of life, and stress.
Self-efficacy, or the belief in one's ability to perform a task successfully, is a critical factor in sustaining any health-related behavior. The review found weak but generally positive effects of strength training on self-efficacy in individuals with overweight or obesity. These improvements may be linked to small but meaningful gains in physical strength and functional capacity, which can enhance individuals’ confidence in their ability to manage daily challenges.
Self-esteem, similarly, showed modestly positive outcomes in the studies reviewed. The researchers noted that participants often felt more empowered and physically competent after engaging in strength exercises, despite initial reluctance or self-consciousness. This can be a crucial factor for those facing weight-related stigma, a common barrier to initiating or maintaining an exercise regimen.
Participants also reported mild improvements in mood and a reduction in psychological disorders such as depression and anxiety. While these effects were not universally consistent across all studies, the findings suggest that strength training may have a stabilizing effect on mood and an indirect impact on managing emotional distress.
Quality of life is another key psychological outcome. The studies consistently showed that engaging in strength training contributed to slight but perceptible improvements in overall life satisfaction and perceived health. This is partly attributed to the fact that strength training often results in tangible physical improvements, which can lead to a more positive self-image and increased independence in daily living.
However, the review also highlighted limitations. Many of the studies assessed broad, global psychological constructs rather than domain-specific ones, leading to a potential dilution of effect sizes. The interventions also tended to be short in duration—approximately three months on average—which may be insufficient for long-term psychological gains, particularly in comparison to aerobic training, which can yield quicker cardiovascular benefits.
Theoretical and Biological Considerations
From a theoretical standpoint, the psychological benefits of strength training among individuals with overweight or obesity can be better understood through the lens of social comparison theory and self-determination theory. Social comparison theory posits that individuals evaluate themselves by comparing their abilities or characteristics to others. In contexts such as a gym or sports facility, individuals who are overweight may feel self-conscious or judged, especially in environments where slimness is perceived as the norm.
However, strength training provides a unique opportunity for favorable comparisons. Unlike aerobic activities such as running, which tend to emphasize speed and endurance, strength training places a clear focus on mechanical performance and measurable progress. This shift in focus may allow individuals to feel a greater sense of mastery and competence, reducing the psychological burden associated with body size or shape. The 2016 and 2022 literature reviews both suggest that when individuals with overweight or obesity can observe meaningful improvements in muscle strength or physical function, they are more likely to develop a positive self-image and a sense of control over their health trajectory.
From a biological perspective, strength training may also contribute to psychological well-being through the release of endorphins and dopamine—neurochemicals associated with feelings of pleasure, reward, and motivation. As participants begin to notice physical gains such as increased strength or reduced fat mass, the positive feedback loop of these neurotransmitters can reinforce the habit of continuing exercise.
Moreover, strength training requires active attention and effort, making it a form of structured mental and physical engagement that can serve as a constructive distraction from negative thoughts or emotional distress. In this way, it functions as a form of behavioral activation, a technique often used in cognitive behavioral therapy to help individuals with depression increase their engagement in rewarding activities.
Gender and Barriers to Participation
The literature review also noted a significant gender disparity in the represented study populations. The majority of the participants in the reviewed studies were female, which may have influenced the findings and the interpretation of psychological outcomes. Women, in particular, may experience unique motivational barriers when engaging in strength training, such as societal norms that emphasize slimness and beauty over strength and muscularity.
Furthermore, the review pointed out that females in the studies often reported greater concerns about body image, self-consciousness, and the potential for social judgment, especially in mixed-gender environments. These concerns may hinder consistent participation in strength-based interventions, despite the evidence that such activities can yield psychological benefits. Therefore, intervention designers should consider gender-specific barriers and tailor environments—such as offering female-only strength training groups or adjusting settings to reduce the perception of weight scrutiny—to improve engagement and adherence.
Additionally, the presence of weight-related stigma in communal exercise spaces like gyms, community centers, and swimming pools was identified as a significant challenge. Individuals who are overweight often internalize weight-related self-stigma, leading to shame, self-doubt, and a reluctance to engage in physical activities where body size is visibly noticeable. Careful consideration should be taken when designing interventions to ensure that they are not inadvertently reinforcing these stigmas through comparisons or competitive structures that emphasize weight or body composition.
Implications for Intervention Design and Mental Health Practice
Given the findings from the reviewed literature, it is evident that strength training holds potential as a complementary or standalone intervention for improving psychological outcomes among individuals with overweight or obesity. However, the small to moderate effect sizes and heterogeneity in the literature suggest that more research is needed to confirm long-term impacts and to better understand how contextual and individual factors influence outcomes.
For mental health practitioners, strength training can be considered as part of a broader integrative strategy to enhance emotional resilience, self-efficacy, and motivation for health behavior change. While it is not a substitute for traditional psychological interventions such as cognitive behavioral therapy or mindfulness-based therapies, it can serve as an effective adjunct tool, especially for clients who struggle with low motivation, low self-esteem, or a sense of hopelessness related to their physical health.
When designing interventions, practitioners and exercise professionals should take into account the following considerations:
- Context-aware settings: Ensure that exercise environments are nonjudgmental and inclusive. Strength training settings should be designed to encourage positive comparisons and emphasize progress over competition.
- Gender-specific adaptations: Address the unique motivations and concerns of female participants, who may be more likely to internalize weight stigma and feel uncomfortable in mixed-gender spaces.
- Mental health integration: Combine strength training with psychological support strategies such as self-monitoring, goal-setting, and cognitive restructuring to address underlying motivational issues and enhance adherence.
- Psychological outcome measurement: Consider using domain-specific psychological measures rather than broad global indices to better capture the specific mental health impacts of strength training.
Conclusion
Emerging research suggests that strength training may offer unique psychological benefits for individuals with overweight or obesity, including improvements in self-efficacy, self-esteem, mood, and quality of life. While the evidence base remains somewhat limited and evolving, the theoretical and observational findings indicate that strength training can serve as an important component in a multidisciplinary approach to mental and physical well-being.
However, the fragmented nature of the current literature and the predominance of short-term studies highlight the need for more rigorous, large-scale, and gender-inclusive research to better understand the long-term psychological impacts of resistance training. Practitioners and researchers should prioritize designing interventions that are cognizant of the unique psychosocial challenges faced by individuals with overweight and obesity and aim to foster environments that are safe, empowering, and inclusive.